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(B) Complex permanent Tissue:
Complex tissues are made of more than one type of cells, e.i consist of different type of cells. All these cells coordinate to perform a common function.
E.g : xylem and phloem etc.
1. Xylem
Xylem is a conducting tissue and constitute a vascular bundle. Xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres.
Forms vascular bundles with phloem and gives mechanical strength to plant due to presence of lignin cells.
Function of xylem:
(i) The xylem carries water and minerals obtained from the soil by roots to the other parts plant.
(ii) It is also responsible for supporting the plant as well as storage and long-distance transportation of water and nutrients from root to other parts.
(iii) Xylem transports materials unilaterally.
(iv) It also provides mechanical strength to the plants.
Elements of xylem:
(i) Tracheids: These are conducting elements.
(ii) Vessels : These are also conducting elements.
(iii) Xylem parenchyma
(iv) Xylem fibres
Dead Cells: Vessels, tracheids and xylem fibres.
Live cells: Xylem parenchyma.
2. Phloem:
Phloem is also a conducting tissue and constitutes a vascular bundle. Phloem is made up of four types of elements: sieve tubes, companion cells, phloem fibres and the phloem parenchyma.
Function of phloem:
(i) Phloem transports products of photosynthesis from the leaves where they are synthesized to other parts of the plant.
(ii) Phloem can move unlike materials of xylem in both directions.
(iii) Phloem has no mechanical function.
Elements of phloem:
(i) Sieve tubes : Sieve tubes are tubular cells with perforated walls.
(ii) Companion cells : These are living cells.
(iii) Phloem fibres
(iv) Phloem parenchyma
Dead Cells: Phloem fibres
Live cells: Sieve tubes, Companion cells and Phloem parenchyma.
Translocation: Transportation of food and nutrients such as sugar and amino acids from leaves to storage organs and growing parts of plant. This movement of substances is called translocation.
Differences between xylem and phloem:
| Xylem | Phloem |
|
1. It transports water and minerals. 2. It provides mechanical supports to the plants. 3. xylem occupies the centre of the vascular bundle. 4. Materials can move in single direction up only e.i unidirection. 5. Conducting and tracheary elements are usually dead. |
1. It transports sugar and amino acids. 2. It does not provide mechanical support 3. Phloem occupies outer side of vascular bundle. 4. Materials can move in both directions up and down, e.i bidirection. 5. Conducting cells are living. |
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Ace your exams with CBSE Notes for Class 9 Science chapter 6. Tissues: Complex permanent Tissue. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 9 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 9 chapter 6. Tissues free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter 6. Tissues – Complex permanent Tissue are the perfect study companion for scoring high marks and mastering the subject.
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